Jan Otto (8 November 1841, Přibyslav – 29 May 1916, Prague) was a Czech publisher and bookseller.

In 1874 he opened a bookstore on Wenceslaus Square in Prague, but after 1910, he concentrated on publishing.

After his death his son and son-in-law took over the company but after lasting troubles, went bankrupt in 1934.

Laciná knihovna národní was a series of affordable but quality books from Czech authors.

He also published collections of several authors, Brehm's Life of Animals, and literary newspapers such as Lumír, Zlatá Praha and Světozor.